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11-18-2020, 10:16 PM | #1 |
Scooby Newbie
Member#: 520372
Join Date: Nov 2020
Chapter/Region:
AKIC
Location: Long island
Vehicle:2015 Wrx Black |
2015 stock boost 13?
I just got a 2015 wrx with 44k miles and ive heard people making more than 13psi of boost is it normal to be making 13 on stock tune
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11-19-2020, 08:08 AM | #2 |
Scooby Newbie
Member#: 424692
Join Date: Jun 2015
Location: NJ
Vehicle:2015 WRX WRB |
I'm gonna have to go with no. I know the boost will vary by temperature, and with your location being in the northeast where it is currently quite cold (with dense air), it will take less boost to get the same amount of airflow through the engine. But even still, 13 sounds low. Typically, stock boost will peak to about 19-20 and then taper down to about 15 by redline.
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11-19-2020, 09:37 AM | #3 | |
Scooby Newbie
Member#: 520372
Join Date: Nov 2020
Chapter/Region:
AKIC
Location: Long island
Vehicle:2015 Wrx Black |
Quote:
Do you think it might be a boost leak? |
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11-19-2020, 10:35 AM | #4 |
Scooby Newbie
Member#: 476872
Join Date: Oct 2017
Location: Quebec, Canada
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11-19-2020, 11:38 AM | #5 |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
Chapter/Region:
NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
As mentioned above, if it is cold out, you are just fine! with super cold weather you might just see 12 or 13 as the air is much more dense and you cap on your fuel delivery.. a datalog would show more info than just OMG it only hit 13psi or whatever. You should be fine if its super cold out.
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11-19-2020, 12:13 PM | #6 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
does the wrx have the S and S# modes that affect boost peak?
my STI is down about 5 psi in S mode compared to S# |
11-19-2020, 12:27 PM | #7 |
Scooby Newbie
Member#: 481754
Join Date: Feb 2018
Location: Beaufort, SC
Vehicle:2017 STi Base Black |
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11-19-2020, 12:49 PM | #8 |
Scooby Newbie
Member#: 501446
Join Date: May 2019
Location: Reno, NV
Vehicle:'15 WRX gone plaid |
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11-19-2020, 01:24 PM | #9 |
Scooby Newbie
Member#: 520372
Join Date: Nov 2020
Chapter/Region:
AKIC
Location: Long island
Vehicle:2015 Wrx Black |
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11-19-2020, 04:56 PM | #10 |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
Chapter/Region:
NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
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11-28-2020, 10:54 AM | #11 | |
Scooby Newbie
Member#: 158185
Join Date: Sep 2007
Chapter/Region:
NWIC
Location: Boise, ID
Vehicle:17 WRX CWP |
Quote:
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11-29-2020, 05:40 PM | #12 |
Scooby Newbie
Member#: 446029
Join Date: May 2016
Location: 510
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On a stock tune, the base boost targets is about 15 psi. It will subtract from base boost target based on intake temps.
It will take away: -8.6psi @ 32F -4.7psi @ 50F -1.6psi @ 68F It will also add boost at warmer intake temps. In extreme heat it will take boost away again. |
11-30-2020, 02:10 PM | #13 | |
Scooby Newbie
Member#: 158185
Join Date: Sep 2007
Chapter/Region:
NWIC
Location: Boise, ID
Vehicle:17 WRX CWP |
Quote:
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11-30-2020, 05:37 PM | #14 |
Scooby Newbie
Member#: 7200
Join Date: Jun 2001
Location: Virginia
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Don't confuse intake air temp with ambient air temp. Intake air temp is usually a little higher. You can use a OBD2 scan tool to see intake air temp.
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12-01-2020, 07:17 AM | #15 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
It is a total nonsense feature. Every time I start the car I have to flick that knob to get full boost, and it's not like you have to be driving hard just because full boost is available But the dumb thing will not stay in S# after shut down, always reverts back to S |
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12-01-2020, 02:55 PM | #16 | |
Scooby Newbie
Member#: 446029
Join Date: May 2016
Location: 510
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Quote:
You will see spikes and overshoot on the stock map because of the aggressive wastegate duty cycle tables. Intake temperature compensations also apply to wastegate similar to boost targets. |
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12-01-2020, 05:39 PM | #17 |
Scooby Newbie
Member#: 501997
Join Date: May 2019
Chapter/Region:
Tri-State
Location: Atglen PA
Vehicle:2011 WRX gray |
Peak boost on 2015 WRX is 15.9 PSI and will taper down to 13 towards redline so if that is what you see this is normal. Stage 2 tune would peak at about 19psi and taper off at redline. Lower then expected boost can be so many things. I would check all intake hose and fittings first if nothing is obvious, smoke test it under pressure.
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12-13-2020, 03:48 PM | #18 |
Scooby Newbie
Member#: 158185
Join Date: Sep 2007
Chapter/Region:
NWIC
Location: Boise, ID
Vehicle:17 WRX CWP |
I'm guessing there's more that goes into the boost target, such as elevation, cuz I was seeing around 11 PSI at -17F. This would be around 5K elevation.
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12-14-2020, 05:09 PM | #19 | |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
Chapter/Region:
NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
Quote:
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12-27-2020, 05:40 PM | #20 |
Scooby Newbie
Member#: 501464
Join Date: May 2019
Location: Colorado
Vehicle:2015 WRX WRBP |
When I was living in CT, my boost would peak around 18psi then taper down to 15psi so maybe a boost leak? I would check the stock BOV as I've heard that some will leak at peak boost.
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